From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Chinner Subject: Re: Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md. Date: Thu, 31 May 2007 11:11:27 +1000 Message-ID: <20070531011127.GO86004887@sgi.com> References: <18006.38689.818186.221707@notabene.brown> <18010.12472.209452.148229@notabene.brown> <20070528024559.GA85884050@sgi.com> <18010.17713.76863.245176@notabene.brown> <20070528042926.GC85884050@sgi.com> <18014.6860.989819.665778@notabene.brown> <20070531010739.GR25091@agk.fab.redhat.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20070531010739.GR25091@agk.fab.redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: device-mapper development , David Chinner , Tejun Heo , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, Jens Axboe , linux-fsdevel@vger.kernel.org, Andreas Dilger List-Id: linux-raid.ids On Thu, May 31, 2007 at 02:07:39AM +0100, Alasdair G Kergon wrote: > On Thu, May 31, 2007 at 10:46:04AM +1000, Neil Brown wrote: > > If a filesystem cares, it could 'ask' as suggested above. > > What would be a good interface for asking? > > XFS already tests: > bd_disk->queue->ordered == QUEUE_ORDERED_NONE The side effects of removing that check is what started this whole discussion. Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group